C# 取几个不重复的随机的值(几种方案)

       public static void DisplayMsg(string sCaption, string sMsg)
       {
           sMsg = sMsg.TrimEnd('!').TrimEnd('！') + " !";
           MessageBox.Show(sMsg, sCaption);
       }

 

 1.

            List<int> arr = Enumerable.Range(0, 11).ToList<int>();
            List<int> result = new List<int>();
            Random ran = new Random();
            for (int i = 0; i < 4; i++)
            {
                int temp = ran.Next(arr.Count);
                result.Add(arr[temp]);
                arr.RemoveAt(temp);
            }
            string sResult = string.Empty;
            for (int i = 0; i < result.Count; i++)
            {
                sResult += result[i] + ",";
            }

            sResult = sResult.TrimEnd(',');
            Common.DisplayMsg(this.Text, sResult);

 

2.

            string sResult = string.Empty;
            var num = Enumerable.Range(0, 11)
    .Select(x => new { v = x, k = Guid.NewGuid().ToString() }).ToList()
    .OrderBy(x => x.k)
    .Select(x => x.v)
    .Take(4).ToList();
            foreach (var i in num)
            {
                sResult += i + ",";
            }

            sResult = sResult.TrimEnd(',');
            Common.DisplayMsg(this.Text, sResult);

 

3.

            string sResult = string.Empty;
            List<int> result = new List<int>();
            while (true)
            {
                Random rd = new Random();
                int a = rd.Next(11);
                if (result.Contains(a))
                    continue;

                result.Add(a);
                if (result.Count == 4)
                    break;
            }

            for (int i = 0; i < result.Count; i++)
            {
                sResult += result[i] + ",";
            }

            sResult = sResult.TrimEnd(',');
            Common.DisplayMsg(this.Text, sResult);

 

4.

            string sResult = string.Empty;
            List<int> list = new List<int>();
            List<int> result = new List<int>();
            Random rd = new Random();
            for (int i = 0; i <= 10; i++)
            {
                list.Add(i);
            }

            while (result.Count<4)
            {
                int index = rd.Next(0, list.Count);
                if (result.Contains(list[index]))
                    continue;
                result.Add(list[index]);
                list.Remove(index);
            }

            for (int i = 0; i < result.Count; i++)
            {
                sResult += result[i] + ",";
            }

            sResult = sResult.TrimEnd(',');
            Common.DisplayMsg(this.Text, sResult);